Definition

1. Adverbial phrase:
   • Within a day / in the space of a single day: Refers to an action, event, or deadline that occurs or must be completed within the 24-hour period of a specified day.
   • Within today / within tomorrow: Often used with a specific day (e.g., hôm nay, ngày mai) to emphasize that something must happen before that particular day ends.

Usage Examples

• Adverbial phrase:
  • Công việc này phải hoàn thành nội nhật hôm nay. (This task must be completed within today.)
  • Thư sẽ được giao nội nhật ngày mai. (The letter will be delivered within tomorrow.)
  • Chúng tôi sẽ phản hồi nội nhật. (We will respond within the day.)

Advanced Usage

• Used in formal, administrative, or business contexts to specify tight, same-day deadlines.
• Often precedes the specific day it modifies (e.g., nội nhật hôm nay, nội nhật ngày 15).

Variants and Related Words

• Trong ngày: (adverbial phrase) during the day, within the day. A more common, less formal synonym.
  • Hàng sẽ giao trong ngày. (Goods will be delivered within the day.)

Synonyms

• Within the day: Inside the timeframe of a single day.
• By the end of the day (today): Specifically for the current day (when used with "hôm nay").
• Intraday: Occurring within a single day (technical/financial context).

1. Within a day
   • Nội nhật ngày hôm nay
     Within today